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          <h1 class="post-title" itemprop="name headline">自测习题集(2)</h1>
        

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class="line">152</span><br></pre></td><td class="code"><pre><span class="line">// demo1</span><br><span class="line">function C1(name) &#123;</span><br><span class="line">  if (name) this.name = name;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">function C2(name) &#123;</span><br><span class="line">  this.name = name;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">function C3(name) &#123;</span><br><span class="line">  this.name = name || &apos;fe&apos;;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">C1.prototype.name = &apos;test&apos;;</span><br><span class="line">C2.prototype.name = &apos;lao&apos;;</span><br><span class="line">C3.prototype.name = &apos;wang&apos;;</span><br><span class="line"></span><br><span class="line">console.log((new C1().name) + (new C2().name) + (new C3().name));</span><br><span class="line">// C1压根没有值, C2有值, 但是是undefined</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">// demo2</span><br><span class="line">// 按引用(地址)传递</span><br><span class="line">var s = &#123;a: 1&#125;;</span><br><span class="line">var q = s;</span><br><span class="line">q.test = 2;</span><br><span class="line">console.log(s);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">// demo3</span><br><span class="line">// 按值(拷贝一份)传递</span><br><span class="line">var s = 1;</span><br><span class="line">var q = s;</span><br><span class="line">q.test = 2;</span><br><span class="line">console.log(s);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">// demo4</span><br><span class="line">function test(m) &#123;</span><br><span class="line">  m.v= 20;</span><br><span class="line">&#125;</span><br><span class="line">var m = &#123;</span><br><span class="line">  k: 30</span><br><span class="line">&#125;;</span><br><span class="line">test(m);</span><br><span class="line">console.log(m.v);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">// demo5</span><br><span class="line">function test(m) &#123;</span><br><span class="line">  m = &#123;</span><br><span class="line">    v: 5</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line">var m = &#123;</span><br><span class="line">    k: 30</span><br><span class="line">&#125;;</span><br><span class="line">test(m);</span><br><span class="line">console.log(m.v);</span><br><span class="line">// 形参与实参, 形参m 相当于 var m; m = 传进来的值, 即&#123;k: 30&#125;, 此m非彼m;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">// demo6</span><br><span class="line">function test() &#123;</span><br><span class="line">  console.log(1);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">(function() &#123;</span><br><span class="line">  // ...</span><br><span class="line">  if(false) &#123;</span><br><span class="line">    function test() &#123;</span><br><span class="line">      console.log(2);</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">  test();</span><br><span class="line">&#125;)();</span><br><span class="line">// 不同浏览器结果不一致</span><br><span class="line">// 1. 老式浏览器IE, 变量(整个函数体)提升</span><br><span class="line">// 2. 现在浏览器, 在块级作用域中, 不管条件是否成立, 只提升变量, 不提升函数体</span><br><span class="line">// (提升, 指的是提升到当前函数作用域的顶部)</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">// demo7</span><br><span class="line">// 用一句话算出0-100之间学生的学生等级, 如90-100输出为一等生, 80-89为二等生, 以此类推;</span><br><span class="line">// 不允许使用 if switch等;</span><br><span class="line">  </span><br><span class="line">Math.ceil(10 - 90/10);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">// demo7</span><br><span class="line">// 用一句话遍历变量a, 禁用for等, 已知 var a = &apos;abc&apos;;</span><br><span class="line">var a = &apos;abc&apos;;</span><br><span class="line">Array.from(a);</span><br><span class="line">[...new Set(a)];  // http://es6.ruanyifeng.com/#docs/set-map</span><br><span class="line">Array.prototype.slice.call(a);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">// demo8</span><br><span class="line">// 写出js面向对象编程的混合式继承, 并写出es6版的继承</span><br><span class="line">  // 要求: 汽车是父类, Cruze是子类, 父类有颜色, 价格属性, 有售卖的方法,</span><br><span class="line">  // Cruze子类实现父类颜色是红色, 价格是140000,</span><br><span class="line">  // 售卖方法实现输出如下语句: 将红色的Cruze卖给了小王的价格是14w</span><br><span class="line">  // Object.create(null);  // 创建没有原型链的对象</span><br><span class="line">// ES5</span><br><span class="line">function Car(color) &#123;</span><br><span class="line">  this.color = color;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line">Car.prototype.show = function() &#123;</span><br><span class="line">  console.log(this.color);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">function BMW(color) &#123;</span><br><span class="line">  Car.call(this, color);</span><br><span class="line">&#125;</span><br><span class="line">// 下面的方式会破坏父类的原型对象</span><br><span class="line">// BMW.prototype = Car.prototype;</span><br><span class="line">// BMW.prototype.aa = function()&#123;&#125;</span><br><span class="line"></span><br><span class="line">// Object.create()方法创建一个新对象，</span><br><span class="line">// 接收一个参数(对象), 作为新创建对象的原型对象</span><br><span class="line">BMW.prototype = Object.create(Car.prototype);</span><br><span class="line">BMW.prototype.constructor = BMW;  // copy自Car的原型对象, 因此默认指向Car</span><br><span class="line">BMW.prototype.test = function() &#123;&#125;;</span><br><span class="line">const bmw = new BMW(&apos;red&apos;);</span><br><span class="line"></span><br><span class="line">// ES6</span><br><span class="line">class SuperType &#123;</span><br><span class="line">  constructor(color)&#123;</span><br><span class="line">    this.color = color;</span><br><span class="line">  &#125;</span><br><span class="line">  show() &#123;</span><br><span class="line">    console.log(this.color);</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">class SubType extends SuperType&#123;</span><br><span class="line">  constructor(color)&#123;</span><br><span class="line">    // super如果不调用, 就是this</span><br><span class="line">    super(color);</span><br><span class="line">    super.name = &apos;subtype&apos;;</span><br><span class="line">  &#125;</span><br><span class="line">  test() &#123;</span><br><span class="line">    console.log(1);</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line">SubType.prototype.test = function() &#123;</span><br><span class="line">  console.log(2);</span><br><span class="line">&#125;</span><br><span class="line">const p = new SubType(&apos;red&apos;);</span><br><span class="line">p.show();</span><br><span class="line">p.test();</span><br></pre></td></tr></table></figure>
      
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